JPS6247005Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mounting structure for an overheating prevention device that stops the operation of the combustion device when the vaporization pot overheats to ensure safety in a vaporization combustion device used in hot water boilers, etc. .

Generally, overheating prevention temperature fuses and switches must operate reliably against overheating, and for this purpose, they must be installed at a location in the combustion equipment where the temperature is stable, and must be responsive to overheating. Must be good.

However, in conventional vaporization combustion devices, in which the vaporization pot with a heater embedded in it that vaporizes liquid fuel is placed so as to form an air passage between it and the blower pot, a temperature fuse to prevent overheating is installed near the wall of the blower pot. Therefore, when the vaporizing pot overheats, the thermal response of the fuse is delayed, and malfunctions may occur due to external factors such as variations in intake air temperature. Furthermore, since the overheating preventive device is disposed in the circumferential direction of the blower pot, this sometimes imposes restrictions on the layout of related parts of the combustion device disposed near the blower pot.

The present invention was developed in view of the above points, and focused on the fact that the heater lead-out end is led out from the vaporizing pot, and a heat transfer member is attached using a heat-conducting outer skin that covers the heater lead-out end. In addition to improving the thermal response of the overheating preventer, the blower pot is prevented from expanding in the circumferential direction, thereby making the combustion device more compact.

Embodiments will be described below with reference to FIGS. 1 to 3.

First, reference numeral 1 is a vaporization type combustion device, in which liquid fuel is pumped by an electromagnetic pump 4 into a vaporization pot 3 preheated by a heater 2, and is ejected from a liquid fuel supply nozzle 5. While vaporizing by colliding with the bottom wall 32, the vaporizing pot 3
A ventilation pot 6 that covers the side wall 31 and bottom wall 32 of
The primary air from the blower 9 is sent from the air passage 7 formed by the air passage 7 to the nozzle insertion port 8 of the vaporization pot 3 to form a premixed gas of vaporized fuel and primary air in the vaporization pot 3. the mixing ring 1
Combustion is carried out at a burner flame port 11 provided above the vaporizing pot 3 through the vaporizer. In addition, during combustion, this combustion device 1 mainly recovers heat through heat conduction from the flame to the vaporizer pot 3, and when the temperature of the vaporizer pot 3 is low, a temperature sensor attached to the side wall 31 of the vaporizer pot 3 ( (not shown) controls the heater 2 on and off to maintain the vaporization pot 3 at the optimum vaporization temperature. By the way, the heater 2 has a thermally conductive outer skin 2.
1, and a highly insulating powder 22 with good thermal conductivity is filled between the heater 2 and the outer skin 21. Further, the vaporizing pot 3 is made of aluminum die-casting, and the outer skin 21 of the heater 2 is buried therein at the time of manufacture. The vaporizing pot 3 is arranged so as to form an air passage 7 with the blowing pot 6, and a sealing material 20 is interposed at the abutting portion thereof.

And the lead-out end 211 of the outer skin 21 of the heater 21
The heat transfer member 12 consisting of a holding part 121 and a mounting part 122 is fixed by the mounting part 122 . Here, the heat transfer member has a gourd shape with an open end 13, and its mounting portion 122 is engaged with the lead-out end 211 of the outer skin 21 from the open end 15, and the holding portion 121 is used as an overheat prevention device. A thermal fuse 13 for preventing overheating is supported by a pinch screw 14 along the leading end 211 of the outer skin 21.

By the way, the temperature fuse 13 for overheating prevention is connected in series with a relay contact etc. that is opened and closed by a temperature sensor (not shown), and when it is fused, it is connected to the electromagnetic pump 4, the heater 2, and the blower 9 that forcibly blows combustion air.
etc., it is configured to cut off power to all electrical components of the combustion device 1 and stop their operations.

In the embodiment configured as described above, when the combustion device 1 is operating normally, the temperature sensor (not shown) turns on and off the heater 2 to keep the temperature of the vaporizing pot 3 constant. Therefore, the temperature of the outer skin 21 of the heater 2 embedded in the vaporization pot 3 and its lead-out end 211 is also kept constant. That is, the temperature of the outer skin 21 of the heater 2 and its lead-out end 211 remains constant regardless of changes in the temperature of the intake air, so they are suitable parts for knowing the temperature state of the vaporizing pot 3. Therefore, vaporizer pot 3
When the heater overheats, the heat is transferred to heater 2 without delay.
The heat is transmitted from the outer skin 21 to the heat transfer member 12, and melts the overheat prevention temperature fuse 13. As a result, damage to the combustion device 1 and its accessories and fires are prevented.

Of course, the vaporization pot 3 and the lead-out end 211 of the outer skin 21
Since the temperatures of the heat transfer member 12 and the heat transfer member 12 are almost the same, there is no possibility of malfunction.

Furthermore, the temperature fuse 13 for overheating prevention is connected to the heater 2.
It is supported along the lead-out end portion 211 of the outer skin 21 in the ventilating pot 6, and is compact because it does not extend in the circumferential direction of the ventilation pot 6.

Although the embodiments have been explained above, an overheating prevention temperature switch may be used as the overheating prevention device.

As mentioned above, the present invention connects the vaporization pot 3 in which the heater 2 for vaporizing liquid fuel is embedded to the ventilation pot 6.
In the evaporative combustion device 1, which is arranged so as to form a space passage 7 between the Heat transfer member 1
2 is fixed by the mounting portion 122, while the overheat prevention device such as the temperature fuse 13 for overheat prevention is supported by the holding portion 121 of the heat transfer member 12, so that the overheat prevention device is secured. This is an excellent idea in practical terms, as it can be expected to perform well and the entire device can be made compact.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a vaporizing combustion device to which the present invention can be applied, Fig. 2 is a longitudinal sectional view of a main part of a vaporizing combustion device showing an embodiment of the invention, and Fig. 3 is a main part of an embodiment of the invention. It is an exploded perspective view. 2... Heater, 21... Outer skin, 211... Leading end of outer skin, 3... Evaporation pot, 6... Air blowing pot, 7... Air passage, 12... Heat transfer member, 121
...Holding part, 122...Mounting part, 13...Temperature fuse for overheating prevention.

Claims (1)

[Scope of utility model registration request] In a vaporization type combustion device in which a vaporization pot in which a heater for vaporizing liquid fuel is embedded is arranged to form an air passage between the pot and a blower pot, the outlet end of a thermally conductive outer cover covering the heater is provided. , wherein a heat transfer member consisting of a holding part and a mounting part is fixed by the mounting part, and an overheat prevention device such as a temperature fuse for preventing overheating is supported by the holding part of the heat transfer member. Mounting structure for overheating prevention equipment in vaporizing combustion equipment.